Today’s invention is an addition to the very useful SeatGuru website.
Opinions differ as to where exactly the best seats are for minimal motion sickness. I tend to favour over the wings, but there is no real basis for my preference.
My suggestion is therefore to place accelerometers (an iPhone might suffice) in a variety of seats within each of a number of each type of airliner.
Over time, these would provide information about the accelerations felt locally and allow an online map overlay of where the motion sickness is likely to be least.
(Alternatively, cabin crew could gather data about the locations from which most sick bags get collected, but I suspect the other approach would be more accurate).